Aker. Name given to a tidal bore sometimes met with in estuaries. Cognate with 'Eagre', 'Acker'.
Al. Arabic word meaning 'The'.
Alba.* Old name for a lighthouse or beacon.
Albacore.Small edible fish of mackerel family. Found near West Indies and in Pacific Ocean.
Albedo. Light reflecting power of Moon, planet or satellite. Value is expressed as a fraction that denotes proportion of light that is reflected. Term may be used in connection with radiations other than light.
Albiero. Star Cygni. S.H.A. 68°; Dec. N 28°; Mag. 3-2.
Alcor. Name of a small star close to Mizar in Ursa Major. Is often called 'the rider' (of one of the horses of Charles' Wain), or 'the Tester' (of eyesight).
Alcyone.Star Tauri. S.H.A. 304°; Dec. N 24°; Mag. 3-0. Name is Greek for 'Kingfisher'. At one time was thought to be the central star of the Universe.
Aldebaran. Star Tauri. a R.A. 04h 33m; Dec. N 16°; Mag. 1-1. S.H.A. 292°. Diameter is 60 times that of Sun; distant 57 light years; temperature 3300°A. Is one of the Hyades. Name is Arabic for 'Eye of the Bull'.
Alderamin. Star Cephei. S.H.A. 41°; Dec. N 62°; Mag. 2-6.